Fimbulwinter
type: MusicGroup
genre: black metal
description: Fimbulwinter (, ) is the immediate prelude to the events of Ragnarök in Norse mythology. Etymology comes from Old Norse, meaning "awful, mighty winter". The prefix fimbul, albeit with a largely unkn
popularity: 6
followers: 2530
additional property: CopyrightID
additional property: CopyrightChainExplorerURL
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  value: 2026-06-17T19:19:19Z
additional property: OTSCanonicalRecord
additional property: OTSVerifyInstructions
  type: PropertyValue
  value: 1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin
subject of: OpenTimestamps Proof of Existence
  type: DigitalDocument
  encoding format: application/vnd.opentimestamps.ots
  description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb6a4e77fe6ee1626317de791cc682e71839e21cd37f1920ce4827ca466bccf6. Chain 2 (Bitcoin): anchored in block 954131 (2026-06-17T19:19:19Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7c3dc71b-2a4e-4f0c-9b1f-35ab0c87ce01.json and https://artists.proofprofile.net/proofs/artist/7c3dc71b-2a4e-4f0c-9b1f-35ab0c87ce01.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
  date published: 2026-06-17T19:19:19Z
album: Servants of Sorcery (2023 Remastered)
  type: MusicAlbum
  date published: 2023-11-10
  track: Black Metal Storm - 2023 Remastered
    type: MusicRecording
    duration: PT3M11S
    duration ms: 191813
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    by artist: Fimbulwinter
    in album: Servants of Sorcery (2023 Remastered)
      type: MusicAlbum
      date published: 2023-11-10
    genre: black metal
    isrc code: GBCQV2200659
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    additional property: OTSTimestamp
      type: PropertyValue
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    additional property: OTSVerifyInstructions
      type: PropertyValue
      value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
    subject of: OpenTimestamps Proof of Existence
      type: DigitalDocument
      encoding format: application/vnd.opentimestamps.ots
      description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ef2038c76d225ff92f53764de4b3b2bb317df1d27b0ac1a20055d90db70e252. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBCQV2200659.
      date published: 2026-07-05T18:48:28Z
    audio: Black Metal Storm - 2023 Remastered
      type: AudioObject
      additional property: Tempo (BPM)
        type: PropertyValue
        value: 166.591
      additional property: Musical Key
        type: PropertyValue
        value: 10
      additional property: Mode (Major/Minor)
        type: PropertyValue
        value: 0
      additional property: Time Signature
        type: PropertyValue
        value: 4
      additional property: Danceability
        type: PropertyValue
        value: 0.095
      additional property: Energy
        type: PropertyValue
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      additional property: Speechiness
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        value: 0.052
      additional property: Acousticness
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        value: 0
      additional property: Instrumentalness
        type: PropertyValue
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      additional property: Liveness
        type: PropertyValue
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      additional property: Valence (Positivity)
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      additional property: Loudness (dB)
        type: PropertyValue
        value: -9.481
      additional property: Key Name
        type: PropertyValue
        value: Bb
      additional property: Mode Name
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        value: Minor
track: Black Metal Storm
  type: MusicRecording
  duration: PT3M10S
  duration ms: 190826
  explicit: false
  by artist: Fimbulwinter
  in album: Dark Side of the Sacred Star (Peaceville Compilation)
    type: MusicAlbum
    date published: 2023-03-03
  isrc code: GBCQV2200659
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  additional property: OTSTimestamp
    type: PropertyValue
    value: 2026-07-08T03:53:27Z
  additional property: OTSVerifyInstructions
    type: PropertyValue
    value: 1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
  subject of: OpenTimestamps Proof of Existence
    type: DigitalDocument
    encoding format: application/vnd.opentimestamps.ots
    description: Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ef2038c76d225ff92f53764de4b3b2bb317df1d27b0ac1a20055d90db70e252. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBCQV2200659.
    date published: 2026-07-08T03:53:27Z
  audio: Black Metal Storm
    type: AudioObject
    additional property: Tempo (BPM)
      type: PropertyValue
      value: 165.602
    additional property: Musical Key
      type: PropertyValue
      value: 10
    additional property: Mode (Major/Minor)
      type: PropertyValue
      value: 0
    additional property: Time Signature
      type: PropertyValue
      value: 5
    additional property: Danceability
      type: PropertyValue
      value: 0.156
    additional property: Energy
      type: PropertyValue
      value: 0.896
    additional property: Speechiness
      type: PropertyValue
      value: 0.049
    additional property: Acousticness
      type: PropertyValue
      value: 0
    additional property: Instrumentalness
      type: PropertyValue
      value: 0.868
    additional property: Liveness
      type: PropertyValue
      value: 0.108
    additional property: Valence (Positivity)
      type: PropertyValue
      value: 0.596
    additional property: Loudness (dB)
    additional property: Key Name
    additional property: Mode Name

Loudness (dB)
type: PropertyValue
value: -15.502

Key Name
type: PropertyValue
value: Bb

Mode Name
type: PropertyValue
value: Minor